
3-PHASE BRUSHLESS MOTOR CONTROL
M56733AFP
MITSUBISHI <CONTROL / DRIVER IC>
DESCRIPTION
The M56733AFP is a semiconductor integrated circuit designed as
a single chip controller for the FDD spindle motor. The IC is
equipped with a power amplifier, hole amplifier, FG amplifier,
oscillator, speed discriminator, and various types of protection
circuits.
Equipped with MOD pin that enables 3-speed switching with a
single pin, the M56733AFP is very convenient to make system
compact.
FEATURES
qProvided with digital servo enabling high precision, high stability
and non-adjustment.
q3-speed switching function with a pin .................................. MOD
q Enable two systems .......................................................... ENEN
qIO (peak)=1.0A
qLow capacitance of dumping capacitor
APPLICATION
FDD spindle motor (5")
RECOMMENDED OPERATING CONDITIONS
Supply voltage ................................................. 10.8 – 12.0 – 13.2 V
Oscillation frequency .......................................................... 492 kHz
Maximum output current ..................................................... 800 mA
FG amplifier input signal level .............................. 5 mVp-p or more
BLOCK DIAGRAM
PIN CONFIGURATION (TOP VIEW)
Outline 36P2R-D
36
33
34
35
1
4
3
2
32
5
31
6
28
9
27
10
26
11
25
12
13
14
24
23
7
8
30
29
15
22
16
21
17
20
18
19
OSCIN
GND
HB
VCC
FGMoni
FGIN+
MOD
OSCOUT
EN
FGIN–
FLT
DSCOUT
GND
U
V
HV+
RF
HV–
HW+
HW–
HU–
ERRIN–
ERROUT
W
HU+
M5
6733A
F
P
31
RF
36
U
35
V
34
W
33
HU+
32
HU–
24
HV+
23
HV–
22
HW+
21
3
FG–
4
FG+
LOGIC
TSD
FG
CTL
VREF
OVSD
17
FLT
20
ERROUT
19
ERRIN(–)
18
DSCOUT
GND
16 MOD
HW–
2
Hall
Bias
6
EN
13
EN
5
FG
(Monitor)
14
OSCIN
15
OSCOUT
OSC
1 / N
DISCRIMINATOR
ERR
EN
CONTROL
1
VCC
7
12
25
30
–